1. An accurate vehicle guidance system can be favorable to lots of working of many large agriculturalmechanics, and the study of automatic path following system is an important problem.
2. The nature of agricultural particle materiel lies between solid and fluid, though the particle is of simple structure, but it has complicated mechanics characteristics.
散粒物料的性质介于固体和流体之间，虽然颗粒结构简单，却具有复杂的力学特性。
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3. The nature of agricultural particle materiel lies between solid and fluid, though the particle is of simple structure, but it has complicated mechanics characteristics.
